| 摘要 |
A single key-operated keeper lock for a zipper-type slide fastener includes a barrel assembly of a tubular barrel and an anvil fixed to and projecting radially from the barrel, a plug assembly of a lock cylinder rotatably received in the barrel and a keeper arm fixed to and projecting radially from the cylinder adjacent to a proximal end thereof, the plug assembly being rotatable relative to the barrel assembly between alternate positions for alternately securing a fastener element between the keeper arm and the anvil, and releasing the element, tumblers carried by the cylinder, movable into engagement with the barrel to prevent the relative rotation, and movable out of such engagement by insertion of a key in the cylinder in the direction of the axis of rotation, a locking bar reciprocally movable in the barrel rectilinearly along such axis between a base portion of the barrel and a distal end portion of the cylinder, the base portion defining a recess receiving the locking bar in each of the several positions of the locking bar along the axis to prevent relative rotation between the barrel and the locking bar, the distal end portion of the cylinder having a pair of flanges defining between them a recess receiving the locking bar to prevent relative rotation between the cylinder and the locking bar and thereby also between the plug assembly and the barrel assembly, a spring resiliently biasing the locking bar into the recess in the distal end portion, and a stem on the locking bar and received in the distal end portion of the cylinder for engagement by the key being inserted to move the locking bar out of the latter recess, thereby to free the plug assembly for rotation relative to the barrel assembly.
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